CN112505693B - Interferometric inverse synthetic aperture radar imaging registration method, system and storage medium - Google Patents
Interferometric inverse synthetic aperture radar imaging registration method, system and storage medium Download PDFInfo
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Abstract
The application discloses an interferometric inverse synthetic aperture radar imaging registration method, system and storage medium, wherein the method comprises the following steps: collecting echo signals of a target to be detected; acquiring an echo one-dimensional image sequence according to an echo signal, wherein the echo one-dimensional image sequence comprises a first echo one-dimensional image sequence and a second echo one-dimensional image sequence; performing distance phase cancellation on the second echo one-dimensional image sequence; and carrying out azimuth phase cancellation on the second echo one-dimensional image sequence. According to the method and the device for detecting the interference inverse synthetic aperture radar image, the echo signals of the target to be detected are collected and converted into the echo one-dimensional image sequence, and the echo one-dimensional image sequence is subjected to distance direction cancellation and azimuth direction cancellation, so that the registration of the interference inverse synthetic aperture radar image is achieved. Compared with the existing registration method, the registration mode using the distance direction cancellation and the azimuth direction cancellation has higher precision. The method can be widely applied to the technical field of interference inverse synthetic aperture radar imaging.
Description
Technical Field
The application relates to the technical field of interference inverse synthetic aperture radar imaging, in particular to an interference inverse synthetic aperture radar imaging registration method, an interference inverse synthetic aperture radar imaging registration system and a storage medium.
Background
The interference inverse synthetic aperture radar imaging technology obtains the real three-dimensional distribution of the equivalent scattering center of the target by carrying out interference processing on a plurality of inverse synthetic aperture Lei Dafu images with a certain visual angle difference. The essence of interferometric inverse synthetic aperture radar imaging is to take advantage of the phase difference between the inverse synthetic aperture radar images of different receive antennas to obtain third dimensional information of the target. The phase difference must be the same scattering point for the same position component as reflected on the inverse synthetic aperture radar image. For space targets, since the distance between the imaging plane and the antenna is far longer than the baseline length between different receiving antennas, the imaging planes of the different receiving antennas can be considered to be consistent, and the structure of the inverse synthetic aperture radar image is also consistent. In the application of interference inverse synthetic aperture radar imaging, due to the fact that the positions of the spatial targets are different relative to different receiving antennas, echo signals received by the antennas have certain wave path differences, and therefore the positions of target bodies in the inverse synthetic aperture radar images of the different antennas are inconsistent, namely mismatch phenomenon exists. If registration is not performed, the imaging effect of the interference inverse synthetic aperture radar is directly affected.
The existing inverse synthetic aperture radar image registration method mainly comprises a registration method based on a correlation coefficient and a registration method based on angular motion parameter estimation. The theoretical basis of the inverse synthetic aperture radar image registration method based on the correlation coefficient is as follows: two inverse synthetic aperture radar images derived from the same target are correlated with each other, and when the two images are aligned, the correlation coefficient reaches a maximum. The specific implementation method is that one inverse synthetic aperture radar image is subjected to stepping translation on the distance and azimuth images, and the correlation coefficient between the two inverse synthetic aperture radar images is used as an evaluation function to search the optimal offset, so that registration is realized. This method has three major drawbacks. Firstly, the upward translation operation of the inverse synthetic aperture radar image distance is carried out, particularly when the translation is measured by decimal, the phase distribution of the one-dimensional range profile is changed, so that the focusing state of the inverse synthetic aperture radar image is changed, errors are introduced to the correlation coefficient, and registration deviation is caused. Secondly, the method for realizing the azimuth translation of the inverse synthetic aperture radar image by multiplying the linear phase in the slow time domain is not suitable. In practice, the phase difference sequences causing the mismatching of the azimuth directions of the images of different antennas of the inverse synthetic aperture radar are often not strictly linear, and the mismatching amounts of the azimuth directions of different scattering points can also be different. Compensating for the nonlinear phase difference with a simple linear phase and compensating for the positional shift of the individual scattering points with an overall translation necessarily brings about an error. Third, the definition of the correlation coefficient is based on the amplitude of the inverse synthetic aperture radar image, and no phase information is considered. And the high-precision inverse synthetic aperture radar image registration is not only embodied on the amplitude, but also requires the phase coherence. In addition, before registration, if the focusing states of the two inverse synthetic aperture radar images are different, even if the two images are at accurate registration positions, the correlation coefficient does not necessarily take the maximum value, and thus an accurate registration result cannot be obtained. The inverse synthetic aperture radar image registration method based on angular motion parameter estimation only stays in the theoretical analysis and simulation stage at present. The method has the following thought: and estimating and compensating the phase difference of the translational components of the target relative to different antennas, then carrying out uniform translational component compensation on each antenna, further realizing accurate compensation of the translational components of the target relative to different antennas, and finally eliminating the azimuth mismatch of the inverse synthetic aperture radar image. The method has the premise that the radar sampling windowing position can accurately track the target, envelope alignment is not needed, or sampling windowing error amounts of different radars are the same, which cannot be met in practice. In practice, sampling windowing errors of different radars are different, and different errors are introduced in the envelope alignment process of one-dimensional image sequences of different radars. Therefore, in the initial phase compensation process, the difference of the phase compensation amounts of different radar one-dimensional image sequences is derived from not only the difference of translational components, but also different error amounts introduced in the envelope alignment process. Therefore, the imaging precision of the interference inverse synthetic aperture radar obtained by the existing registration method based on the correlation coefficient and the registration method based on the angular motion parameter estimation is low.
Disclosure of Invention
In view of this, it is an object of the present application to provide an interferometric inverse synthetic aperture radar imaging registration method, system and storage medium to improve interferometric inverse synthetic aperture radar imaging accuracy.
The first technical scheme adopted by the application is as follows:
an interferometric inverse synthetic aperture radar image registration method, the interferometric inverse synthetic aperture radar comprising a first antenna and a number of second antennas, comprising:
collecting echo signals of a target to be detected, wherein the echo signals comprise a first echo signal and a plurality of second echo signals, the first echo signals and the second echo signals correspond to transmitting signals of the first antenna, the first echo signals are echo signals collected by the first antenna, and the second echo signals are echo signals collected by the second antenna;
acquiring an echo one-dimensional image sequence according to the echo signal, wherein the echo one-dimensional image sequence comprises a first echo one-dimensional image sequence and a second echo one-dimensional image sequence, the first echo one-dimensional image sequence corresponds to the first echo signal, and the second echo one-dimensional image sequence corresponds to the second echo signal;
performing distance phase cancellation on the second echo one-dimensional image sequence;
and carrying out azimuth phase cancellation on the second echo one-dimensional image sequence.
Further, the step of acquiring an echo one-dimensional image sequence according to the echo signal includes:
and inputting the echo signals into a matched filter to obtain an echo one-dimensional image sequence, wherein the matched filter is constructed according to the transmitting signals.
Further, between the step of acquiring an echo one-dimensional image sequence according to the echo signal and the step of performing distance phase cancellation on the echo one-dimensional image sequence, the method further comprises the following steps:
envelope alignment is carried out on the echo one-dimensional image sequence.
Further, between the step of performing distance phase cancellation on the echo one-dimensional image sequence and the step of performing azimuth phase cancellation on the echo one-dimensional image sequence, the method further comprises the following steps:
acquiring motion parameters of the target to be detected;
and carrying out phase correction on the echo one-dimensional image sequence according to the motion parameters.
Further, the step of performing distance phase cancellation on the second echo one-dimensional image sequence includes:
calculating a distance compensation factor according to the position of the first antenna and the position of the second antenna;
and performing distance compensation on the second echo one-dimensional image sequence according to the distance compensation factor.
Further, the step of performing azimuth phase cancellation on the second echo one-dimensional image sequence includes:
acquiring a first equivalent translational speed of the target to be measured relative to the first antenna;
acquiring a second equivalent translational speed of the target to be measured relative to the second antenna;
calculating an azimuth compensation factor according to the first equivalent translational speed and the second equivalent translational speed;
and compensating the second echo one-dimensional image sequence according to the azimuth compensation factor.
Further, the step of performing distance compensation on the second echo one-dimensional image sequence according to the distance compensation factor includes:
and according to the distance compensation factor, performing distance compensation on the second echo one-dimensional image sequence in a frequency domain.
The second technical scheme adopted by the application is as follows:
an interferometric inverse synthetic aperture radar image registration system, comprising:
the system comprises an acquisition module, a first antenna and a second antenna, wherein the acquisition module is used for acquiring echo signals of a target to be detected, the echo signals comprise a first echo signal and a plurality of second echo signals, the first echo signal and the second echo signals correspond to transmitting signals of the first antenna, the first echo signal is the echo signal acquired by the first antenna, and the second echo signal is the echo signal acquired by the second antenna;
the sequence module is used for acquiring an echo one-dimensional image sequence according to the echo signal, wherein the echo one-dimensional image sequence comprises a first echo one-dimensional image sequence and a second echo one-dimensional image sequence, the first echo one-dimensional image sequence corresponds to the first echo signal, and the second echo one-dimensional image sequence corresponds to the second echo signal
The distance module is used for performing distance phase cancellation on the second echo one-dimensional image sequence;
and the azimuth module is used for carrying out azimuth phase cancellation on the second echo one-dimensional image sequence.
The third technical scheme adopted by the application is as follows:
an interferometric inverse synthetic aperture radar image registration system, comprising:
a memory for storing a program;
and the processor is used for loading the program to execute the interference inverse synthetic aperture radar image registration method.
The fourth technical scheme adopted in the application is as follows:
a computer readable storage medium having stored thereon a computer program which when executed by a processor implements the interferometric inverse synthetic aperture radar image registration method.
According to the method and the device for detecting the interference inverse synthetic aperture radar image, the echo signals of the target to be detected are collected and converted into the echo one-dimensional image sequence, and the echo one-dimensional image sequence is subjected to distance direction cancellation and azimuth direction cancellation, so that the registration of the interference inverse synthetic aperture radar image is achieved. Compared with the existing registration method, the registration mode using the distance direction cancellation and the azimuth direction cancellation has higher precision.
Drawings
FIG. 1 is a flow chart of an interferometric inverse synthetic aperture radar image registration method in an embodiment of the present application;
fig. 2 is an antenna position diagram of an interferometric inverse synthetic aperture radar image registration method according to an embodiment of the present application.
Detailed Description
The conception, specific structure, and technical effects produced by the present application will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, aspects, and effects of the present application.
The present application is described in further detail below with reference to the attached drawings and specific examples. The step numbers in the following embodiments are set for convenience of illustration only, and the order between the steps is not limited in any way, and the execution order of the steps in the embodiments may be adaptively adjusted according to the understanding of those skilled in the art. Furthermore, for several of the embodiments described below, it is denoted as at least one.
It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly or indirectly fixed or connected to the other feature. Further, the descriptions of up, down, left, right, etc. used in this application are merely with respect to the mutual positional relationship of the various elements of this application in the drawings. As used in this application, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any combination of one or more of the associated listed items.
It should be understood that although the terms first, second, third, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element of the same type from another. For example, a first element could also be termed a second element, and, similarly, a second element could also be termed a first element, without departing from the scope of the present application. The use of any and all examples, or exemplary language (e.g., "such as") provided herein, is intended merely to better illuminate embodiments of the application and does not pose a limitation on the scope of the application unless otherwise claimed.
Inverse synthetic aperture radar is an important branch of the development of synthetic aperture radar. The inverse synthetic aperture radar is a high-resolution imaging radar different from the conventional radar, and can obtain fine images of non-cooperative moving objects such as airplanes, ships, missiles and the like all day long and remotely. It has great potential for distant targets. However, the implementation of inverse synthetic aperture radar has particular difficulties, one of which is the high accuracy of motion compensation. To achieve imaging of inverse synthetic aperture radar, motion compensation is necessary. Interferometric radars refer to synthetic aperture radars that employ interferometry, also known as dual-antenna synthetic aperture radars or coherent synthetic aperture radars. The method is characterized in that a target is observed through two side-looking antennas at the same time or two parallel observations at a certain time interval, so that a double-imaging image pair of the same area on the ground is obtained, wherein the double-imaging image pair comprises intensity information and phase information. Due to the geometrical relationship between the target and the two antenna positions, the ground target echo forms a phase difference signal, and an interference pattern is formed through complex correlation of two complex images. The interferogram contains accurate information of the position difference between the image point and the two antennas in the oblique direction, namely the change of the echo phase. Therefore, the distance information can be acquired by utilizing the geometrical relationship among the height of the remote sensor, the radar wavelength, the beam view direction and the antenna base line distance, and the elevation information of each point on the image can be accurately measured, so that the high-resolution three-dimensional surface image can be obtained. In the process of extracting three-dimensional information by the interferometric radar, the auxiliary image is required to be registered to the main image, but the registration accuracy and the registration efficiency of the current image registration method are lower.
As shown in fig. 1, an embodiment of the present application provides an image registration method of an interferometric inverse synthetic aperture radar, where the interferometric inverse synthetic aperture radar includes a first antenna and a plurality of second antennas, and includes:
s100, acquiring echo signals of a target to be detected, wherein the echo signals comprise a first echo signal and a plurality of second echo signals, the first echo signals and the second echo signals correspond to transmitting signals of the first antenna, the first echo signals are echo signals acquired by the first antenna, and the second echo signals are echo signals acquired by the second antenna;
s200, acquiring an echo one-dimensional image sequence according to the echo signal, wherein the echo one-dimensional image sequence comprises a first echo one-dimensional image sequence and a second echo one-dimensional image sequence, the first echo one-dimensional image sequence corresponds to the first echo signal, and the second echo one-dimensional image sequence corresponds to the second echo signal;
s300, performing distance phase cancellation on the second echo one-dimensional image sequence;
s400, carrying out azimuth phase cancellation on the second echo one-dimensional image sequence.
In the registration method, the first antenna and the plurality of second antennas can be adopted to acquire a plurality of images of the target to be detected, the plurality of images of the target to be detected are registered, and finally a three-dimensional image of the target to be detected is obtained.
Referring to fig. 2, for example, a three-antenna interference inverse synthetic aperture radar, a first antenna, that is, an antenna a, is located at (0, 0), and the antenna a is used for transmitting a signal and receiving a first echo signal corresponding to the transmitted signal, and a second antenna, that is, an antenna B and an antenna C, are located at (L, 0), (0, L, 0), respectively, and are used for receiving a second echo signal corresponding to the transmitted signal of the antenna a. The antenna pair AB and the antenna pair AC constitute interference baselines in the X-axis and in the Y-axis directions, respectively. Assume that the LFM signal transmitted by antenna a is:
wherein T is p For LFM signal pulse width, f c For carrier frequency, gamma is frequency modulation, t is total time,for fast time, T is pulse repetition interval, T m =mt represents slow time, m=0, 1,2, … … M-1, M is the total number of transmit pulses, rect (x) represents a rectangular envelope function:
the echoes received by each antenna can be expressed as:
where C represents the speed of light, i=a, B, C represents the identity of the antenna A, B, C,representation->Distance from kth scattering center to each receiving antenna at moment, N p Sigma is the number of equivalent scattering centers of the target k Is the backscattering coefficient of the kth scattering center.
Specifically, for any scattering center P on the target, the echo signals received by each antenna are:
for convenience of description, R is used hereinafter IP To replaceUsing R AP Substitute->
Thus, the echo signals received by each antenna can be expressed as:
distance measurement parameter R of each antenna passing through antenna A A_ref The unified windowing acquisition is carried out, and the acquired echo signals are as follows:
after the echo signals are acquired, the acquired echo signals need to be filtered, so that a one-dimensional image sequence of the target to be detected is generated.
Taking antenna a as an example, a matched filter can be constructed as follows:
inputting the acquired echo signals into a matched filter, and obtaining output signals as follows:
after the one-dimensional image sequence of the object to be measured is obtained, in order to improve the accuracy of the obtained one-dimensional image sequence, motion compensation can be performed on the one-dimensional image sequence, wherein the motion compensation comprises envelope alignment and phase correction.
In some embodiments, coherent envelope alignment may be performed on the one-dimensional image sequence of each antenna, so as to obtain a one-dimensional image sequence after envelope alignment:
wherein R is IP0 Indicating the distance between the antenna I and the scattering point P at the initial moment, R A_ref0 Indicating the windowing distance between antenna I and antenna a at the initial time.
From the above analysis, it can be seen that the reason for the misregistration of the inverse synthetic aperture radar images of the antennas in the interference inverse synthetic aperture radar imaging is that the observation positions of the antennas on the same target are different. Therefore, if the inverse synthetic aperture radar images of the antennas can be registered according to the distance and the relative direction between the antennas and the object to be measured, the problem of registration of the inverse synthetic aperture radar images of the different antennas can be solved.
After envelope alignment is carried out on the one-dimensional image sequences of all the antennas, distance phase cancellation is needed to be carried out on different antennas, so that the distance mismatch quantity of the different antennas is compensated.
In the following, an antenna pair AB will be described as an example, and the positions of the scattering center P in the two-antenna inverse synthetic aperture image will be different due to the difference in positions of the scattering center P with respect to the receiving antenna A, B. If the separate windowing acquisition is adopted, the position difference can be eliminated, so that the unified windowing acquisition can be compensated in a signal domain to obtain an effect similar to the separate windowing acquisition.
The parts that need to be canceled are:
wherein R is AO0 And R is BO0 Respectively representing the distances between the center of mass of the target and the antennas A and B at the initial moment, X 0 Representing the initial X-axis directional coordinates of the centroid of the target.
The signal of the antenna B can be compensated in the frequency domain according to the obtained distance compensation factor, the specific operation can be carried out before the one-dimensional image sequence is obtained by matched filtering, and the one-dimensional image sequence with the aligned envelope is subjected to Fourier transformation to obtain a frequency domain expression before pulse pressure:
the following phase compensation is performed on the above:
the frequency domain signal after compensation can be obtained as follows:
the compensated one-dimensional image is obtained as follows:
the amount of misalignment of the scattering point P in the distance direction is available as a quick time characterization:
as can be seen from the above equation, the amount of mismatch of the scattering points of the antenna A, B after phase compensation is the same as that of the respective windows, and the amount of mismatch obtained by quantitative characterization is far smaller than one distance unit. Thus, the amount of mismatch in the distance upward is compensated.
Similarly, the distance compensation factor of the antenna C is:
the one-dimensional image sequence of the antenna C can be compensated according to the distance compensation factor of the antenna C. Wherein R is CO0 Represents the distance between the centroid of the object to be measured at the initial moment and the antenna C, Y 0 And the initial Y-axis direction coordinate of the mass center of the target to be measured is represented.
It should be noted that the uniform registration can be performed only because the mismatch difference between all scattering points is small, and the mismatch compensation factor is independent of each scattering point, so that uniform and accurate registration of all scattering centers on the target is realized.
In some embodiments, phase correction may be performed for each antenna. The antenna A, B is subjected to phase correction by adopting uniform motion parameters, and the obtained inverse synthetic aperture radar images of different antennas can be written as follows:
wherein V is AP_rot 、V BP_rot Representing the equivalent rotational speed, V, of the scattering point P relative to antennas a and B, respectively A_tran 、V B_tran Representing the equivalent translational velocity, T, of the target relative to antennas A and B, respectively 1 T 1 Time is accumulated for imaging.
It can be seen that the difference in the position of the scattering point P relative to the antenna A, B results in a different equivalent translational velocity relative to each antenna, which in turn results in a mismatch in azimuth. Therefore, to complete the registration of the azimuth direction, only the position difference of the scattering point P relative to different antennas needs to be compensated. The one-dimensional image of the antenna B after the phase correction of the unified motion parameter is:
the following azimuth compensation factors are constructed:
compensating the one-dimensional range profile for each pulse echo direction,
the compensated inverse synthetic aperture radar image is thus obtained as:
this is the same as directly performing phase correction of each antenna, and the amount of mismatching in azimuth is far smaller than one doppler cell, i.e. the registration of doppler direction is completed.
Similarly, the azimuth compensation factor of the antenna C is:
the inverse synthetic aperture radar image of antenna C may be registered based on the azimuth compensation factor of antenna C.
The embodiment of the application also provides an interference inverse synthetic aperture radar image registration system, which comprises:
the system comprises an acquisition module, a first antenna and a second antenna, wherein the acquisition module is used for acquiring echo signals of a target to be detected, the echo signals comprise a first echo signal and a plurality of second echo signals, the first echo signal and the second echo signals correspond to transmitting signals of the first antenna, the first echo signal is the echo signal acquired by the first antenna, and the second echo signal is the echo signal acquired by the second antenna;
the sequence module is used for acquiring an echo one-dimensional image sequence according to the echo signal, wherein the echo one-dimensional image sequence comprises a first echo one-dimensional image sequence and a second echo one-dimensional image sequence, the first echo one-dimensional image sequence corresponds to the first echo signal, and the second echo one-dimensional image sequence corresponds to the second echo signal
The distance module is used for performing distance phase cancellation on the second echo one-dimensional image sequence;
and the azimuth module is used for carrying out azimuth phase cancellation on the second echo one-dimensional image sequence.
The content in the method embodiment is applicable to the system embodiment, the functions specifically realized by the system embodiment are the same as those of the method embodiment, and the achieved beneficial effects are the same as those of the method embodiment.
The embodiment of the application also provides an interference inverse synthetic aperture radar image registration system, which comprises:
a memory for storing a program;
and the processor is used for loading the program to execute the interference inverse synthetic aperture radar image registration method.
The content in the method embodiment is applicable to the system embodiment, the functions specifically realized by the system embodiment are the same as those of the method embodiment, and the achieved beneficial effects are the same as those of the method embodiment.
The embodiment of the application also provides a computer readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the method for registering the interference inverse synthetic aperture radar images is realized.
In which processor-executable instructions are stored which, when executed by a processor, are adapted to carry out an interactive information processing method step according to any one of the above-described method embodiments. For the storage medium, it may include high-speed random access memory, but may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. It can be seen that the content in the above method embodiment is applicable to the present storage medium embodiment, and the specific functions of the present storage medium embodiment are the same as those of the above method embodiment, and the achieved beneficial effects are the same as those of the above method embodiment.
The method for compensating the phase cancellation directly compensates the phase of each antenna in a signal domain, and the obtained inverse synthetic aperture radar images of each antenna are registered, so that convenience is provided for subsequent scattering center extraction. At this time, the combined scattering center of each antenna is used for extraction, and the mode of inverse synthetic aperture radar image accumulation of each antenna can be adopted, so that the extracted scattering center is more accurate. The invention plays an important role in promoting the broadband radar target identification to develop towards practical and refined directions.
The content in the method embodiment is applicable to the notebook computer embodiment, and the functions specifically realized by the notebook computer embodiment are the same as those of the method embodiment, and the obtained beneficial effects are the same as those of the method embodiment.
It should be appreciated that the layers, modules, units, and/or platforms, etc. included in the embodiment systems of the present application may be implemented or embodied by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer readable memory. The methods may be implemented in a computer program using standard programming techniques, including a non-transitory computer readable storage medium configured with a computer program, where the storage medium so configured causes a computer to operate in a specific and predefined manner, in accordance with the methods and drawings described in the specific embodiments. Each program may be implemented in a high level procedural or object oriented programming language to communicate with a computer system. However, the program(s) can be implemented in assembly or machine language, if desired. In any case, the language may be a compiled or interpreted language. Furthermore, the program can be run on a programmed application specific integrated circuit for this purpose.
Furthermore, the data processing flows that the layers, modules, units, and/or platforms included in the systems of the embodiments of the present application correspond to perform may be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The data processing flows that the layers, modules, units, and/or platforms included in the systems of the embodiments of the present application correspondingly execute may be executed under the control of one or more computer systems configured with executable instructions, and may be implemented as code (e.g., executable instructions, one or more computer programs, or one or more applications) executing collectively on one or more processors, by hardware, or a combination thereof. The computer program includes a plurality of instructions executable by one or more processors.
Further, the system may be implemented in any type of computing platform operatively connected to a suitable computing platform, including, but not limited to, a personal computer, mini-computer, mainframe, workstation, network or distributed computing environment, separate or integrated computer platform, or in communication with a charged particle tool or other imaging device, and so forth. The data processing flows corresponding to the execution of the layers, modules, units, and/or platforms included in the system of the present application may be implemented in machine readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, an optical read and/or write storage medium, RAM, ROM, etc., so that it may be read by a programmable computer, which when read by a computer, may be used to configure and operate the computer to perform the processes described herein. Further, the machine readable code, or portions thereof, may be transmitted over a wired or wireless network. When such media includes instructions or programs that, in conjunction with a microprocessor or other data processor, implement the steps described above, the invention described herein includes these and other different types of non-transitory computer-readable storage media. The present application also includes the computer itself when programmed according to the methods and techniques described herein.
The present invention is not limited to the above embodiments, but can be modified, equivalent, improved, etc. by the same means to achieve the technical effects of the present invention without departing from the spirit and principles of the present invention. Various modifications and variations are possible in the technical solutions and/or embodiments within the scope of the application.
Claims (7)
1. An interferometric inverse synthetic aperture radar imaging registration method, the interferometric inverse synthetic aperture radar comprising a first antenna and a plurality of second antennas, comprising:
collecting echo signals of a target to be detected, wherein the echo signals comprise a first echo signal and a plurality of second echo signals, the first echo signals and the second echo signals correspond to transmitting signals of the first antenna, the first echo signals are echo signals collected by the first antenna, and the second echo signals are echo signals collected by the second antenna;
acquiring an echo one-dimensional image sequence according to the echo signal, wherein the echo one-dimensional image sequence comprises a first echo one-dimensional image sequence and a second echo one-dimensional image sequence, the first echo one-dimensional image sequence corresponds to the first echo signal, and the second echo one-dimensional image sequence corresponds to the second echo signal;
performing distance phase cancellation on the second echo one-dimensional image sequence;
carrying out azimuth phase cancellation on the second echo one-dimensional image sequence;
the step of performing distance phase cancellation on the second echo one-dimensional image sequence includes:
calculating a distance compensation factor according to the position of the first antenna and the position of the second antenna;
according to the distance compensation factor, performing distance compensation on the second echo one-dimensional image sequence in a frequency domain;
the step of performing azimuth phase cancellation on the second echo one-dimensional image sequence includes:
acquiring a first equivalent translational speed of the target to be measured relative to the first antenna;
acquiring a second equivalent translational speed of the target to be measured relative to the second antenna;
calculating an azimuth compensation factor according to the first equivalent translational speed and the second equivalent translational speed;
and compensating the second echo one-dimensional image sequence according to the azimuth compensation factor.
2. The method of interferometric inverse synthetic aperture radar imaging registration of claim 1, wherein the step of acquiring a sequence of echo one-dimensional images from the echo signals comprises:
and inputting the echo signals into a matched filter to obtain an echo one-dimensional image sequence, wherein the matched filter is constructed according to the transmitting signals.
3. The method according to claim 1, wherein between the step of acquiring an echo one-dimensional image sequence from the echo signal and the step of performing distance phase cancellation on the second echo one-dimensional image sequence, the method further comprises the steps of:
envelope alignment is carried out on the second echo one-dimensional image sequence.
4. The method of imaging registration of an interferometric inverse synthetic aperture radar of claim 1, further comprising, between the step of performing range phase cancellation on the second echo one-dimensional image sequence and the step of performing azimuth phase cancellation on the second echo one-dimensional image sequence, the steps of:
acquiring motion parameters of the target to be detected;
and carrying out phase correction on the second echo one-dimensional image sequence according to the motion parameters.
5. An interferometric inverse synthetic aperture radar imaging registration system, the interferometric inverse synthetic aperture radar comprising a first antenna and a plurality of second antennas, comprising:
the system comprises an acquisition module, a first antenna and a second antenna, wherein the acquisition module is used for acquiring echo signals of a target to be detected, the echo signals comprise a first echo signal and a plurality of second echo signals, the first echo signal and the second echo signals correspond to transmitting signals of the first antenna, the first echo signal is the echo signal acquired by the first antenna, and the second echo signal is the echo signal acquired by the second antenna;
the sequence module is used for acquiring an echo one-dimensional image sequence according to the echo signal, wherein the echo one-dimensional image sequence comprises a first echo one-dimensional image sequence and a second echo one-dimensional image sequence, the first echo one-dimensional image sequence corresponds to the first echo signal, and the second echo one-dimensional image sequence corresponds to the second echo signal
The distance module is used for performing distance phase cancellation on the second echo one-dimensional image sequence;
the azimuth module is used for carrying out azimuth phase cancellation on the second echo one-dimensional image sequence;
the step of performing distance phase cancellation on the second echo one-dimensional image sequence includes:
calculating a distance compensation factor according to the position of the first antenna and the position of the second antenna;
according to the distance compensation factor, performing distance compensation on the second echo one-dimensional image sequence in a frequency domain;
the step of performing azimuth phase cancellation on the second echo one-dimensional image sequence includes:
acquiring a first equivalent translational speed of the target to be measured relative to the first antenna;
acquiring a second equivalent translational speed of the target to be measured relative to the second antenna;
calculating an azimuth compensation factor according to the first equivalent translational speed and the second equivalent translational speed;
and compensating the second echo one-dimensional image sequence according to the azimuth compensation factor.
6. An interferometric inverse synthetic aperture radar imaging registration system, comprising:
a memory for storing a program;
a processor for loading the program to perform the interferometric inverse synthetic aperture radar imaging registration method of any one of claims 1-4.
7. A computer readable storage medium having stored thereon a computer program, which when executed by a processor implements the interferometric inverse synthetic aperture radar imaging registration method of any of claims 1-4.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7259715B1 (en) * | 2002-01-08 | 2007-08-21 | Science Applications International Corporation | Method for developing and using an image reconstruction algorithm for multipath scattering |
| JP2008026106A (en) * | 2006-07-20 | 2008-02-07 | Mitsubishi Electric Corp | Inverse synthetic aperture radar apparatus |
| CN103616688A (en) * | 2013-12-16 | 2014-03-05 | 中国科学院电子学研究所 | Method for improving quality of three-dimensional interferometric inverse synthetic aperture radar image |
| CN105005045A (en) * | 2015-06-26 | 2015-10-28 | 西安电子科技大学 | High-speed target ISAR stepped frequency signal synthesis method based on signal preprocessing |
| CN108415015A (en) * | 2018-03-14 | 2018-08-17 | 哈尔滨工业大学 | Ship Target three-dimensional InISAR imaging methods under a kind of sparse aperture |
| CN109031295A (en) * | 2018-07-17 | 2018-12-18 | 中国人民解放军国防科技大学 | ISAR image registration method based on wave path difference compensation |
| CN109541597A (en) * | 2018-12-12 | 2019-03-29 | 中国人民解放军国防科技大学 | Multi-station radar ISAR image registration method |
| CN109655829A (en) * | 2018-12-27 | 2019-04-19 | 北京冠群桦成信息技术有限公司 | Bistatic ISAR image distortion correction method |
| CN110806577A (en) * | 2019-11-06 | 2020-02-18 | 中国科学院电子学研究所 | Focusing imaging method and device of synthetic aperture radar, equipment and storage medium |
| CN111142105A (en) * | 2020-01-06 | 2020-05-12 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | ISAR imaging method for complex moving target |
-
2020
- 2020-10-22 CN CN202011137420.6A patent/CN112505693B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7259715B1 (en) * | 2002-01-08 | 2007-08-21 | Science Applications International Corporation | Method for developing and using an image reconstruction algorithm for multipath scattering |
| JP2008026106A (en) * | 2006-07-20 | 2008-02-07 | Mitsubishi Electric Corp | Inverse synthetic aperture radar apparatus |
| CN103616688A (en) * | 2013-12-16 | 2014-03-05 | 中国科学院电子学研究所 | Method for improving quality of three-dimensional interferometric inverse synthetic aperture radar image |
| CN105005045A (en) * | 2015-06-26 | 2015-10-28 | 西安电子科技大学 | High-speed target ISAR stepped frequency signal synthesis method based on signal preprocessing |
| CN108415015A (en) * | 2018-03-14 | 2018-08-17 | 哈尔滨工业大学 | Ship Target three-dimensional InISAR imaging methods under a kind of sparse aperture |
| CN109031295A (en) * | 2018-07-17 | 2018-12-18 | 中国人民解放军国防科技大学 | ISAR image registration method based on wave path difference compensation |
| CN109541597A (en) * | 2018-12-12 | 2019-03-29 | 中国人民解放军国防科技大学 | Multi-station radar ISAR image registration method |
| CN109655829A (en) * | 2018-12-27 | 2019-04-19 | 北京冠群桦成信息技术有限公司 | Bistatic ISAR image distortion correction method |
| CN110806577A (en) * | 2019-11-06 | 2020-02-18 | 中国科学院电子学研究所 | Focusing imaging method and device of synthetic aperture radar, equipment and storage medium |
| CN111142105A (en) * | 2020-01-06 | 2020-05-12 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | ISAR imaging method for complex moving target |
Non-Patent Citations (2)
| Title |
|---|
| Review on interferometric ISAR 3D imaging: Concept, technology and experiment;Biao Tian等;《Signal Processing》;第153卷(第8期);第164-187页 * |
| 基于运动模型估计的分布式实时时间配准算法;刘万全等;《现代雷达》;第35卷(第1期);第41-45页 * |
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